code: def cloudwatch_client_stub():
      resource = resource_cache("cloudwatch", "us-west-2")
      with Stubber(resource.meta.client) as stubber:
          yield stubber
          stubber.assert_no_pending_responses()
  
file_path: ray/python/ray/tests/aws/conftest.py
imports: import pytest
  from ray.autoscaler._private.constants import BOTO_MAX_RETRIES
  from ray.autoscaler._private.aws.utils import resource_cache, client_cache
  from botocore.stub import Stubber
label_desc: Use image node_id 5 for calling a global function with example usage: cloudwatch_client_stub() without return types